The Supreme Court is the highest court in Tonga and is responsible for hearing appeals from the Court of Appeal and the High Court.

The Court of Appeal hears appeals from the High Court and is responsible for ensuring that the law is applied correctly and consistently.

The High Court is the primary court in Tonga and hears cases in the first instance. It has jurisdiction over a wide range of matters, including criminal cases, civil cases, and family law matters.

The Magistrate's Court is the lowest court in Tonga and hears minor criminal and civil cases. It has limited jurisdiction and cannot hear cases that are serious or complex.

Appeals from the High Court are filed with the Court of Appeal. The Court of Appeal will then review the decision of the High Court and make a determination as to whether the decision was correct.

Appeals from the Court of Appeal are filed with the Supreme Court. The Supreme Court will then review the decision of the Court of Appeal and make a determination as to whether the decision was correct.

Decisions of the Supreme Court in Tonga are final and cannot be appealed.

The Privy Council is the highest court of appeal for Tonga and hears appeals from the Supreme Court. However, appeals to the Privy Council are only allowed in certain cases, such as cases involving constitutional issues or cases where the amount in dispute is significant.

Appeals in Tonga can be based on errors of law, errors of fact, or miscarriages of justice. An error of law occurs when the lower court applies the law incorrectly. An error of fact occurs when the lower court makes a mistake in finding the facts of the case. A miscarriage of justice occurs when the lower court's decision is so unfair or unjust that it cannot be allowed to stand.

Appeals in Tonga must be filed within 28 days of the date of the decision being appealed.

The fee for filing an appeal in Tonga is T$200.

Legal aid for appeals in Tonga can be obtained by contacting the Legal Aid Commission.

The chances of success on appeal in Tonga are moderate. The success rate of appeals varies depending on the grounds of appeal and the strength of the evidence.

The appellate system in Tonga faces a number of challenges, including lack of resources, delays in the hearing of appeals, and high cost of appeals.

A number of reforms have been proposed to improve the appellate system in Tonga, including increasing the number of judges, streamlining the appeals process, and reducing the cost of appeals.